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2012-09-21offer REALGCC variable to configure musl-gcc wrapper at runtimeRich Felker-1/+1
this is useful when the underlying gcc is already a wrapper, which is the case at least on some uclibc-based system images. it's also useful for running an older/newer/nondefault version of gcc.
2012-09-14remove forced -O3 from shared library CFLAGSRich Felker-1/+1
I originally added -O3 for shared libraries to counteract very bad behavior by GCC when building PIC code: it insists on reloading the GOT register in static functions that need it, even if the address of the function is never leaked from the translation unit and all local callers of the function have already loaded the GOT register. this measurably degrades performance in a few key areas like malloc. the inlining done at -O3 avoids the issue, but that's really not a good reason for overriding the user's choice of optimization level.
2012-08-17split up installation targetRich Felker-2/+10
patch by Luca Barbato (lu_zero)
2012-08-05make dynlink.lo depend on reloc.h in makefileRich Felker-0/+2
this is mainly a development convenience but will also ensure users building from latest git always get up-to-date arch-specific dynamic linker code without having to "make clean".
2012-08-02abstract out compiler runtime library for linking libc.soRich Felker-1/+2
this allows config.mak to override the default -lgcc for building with other compilers such as pcc/clang/etc.
2012-07-11changes to kernel sigaction struct handling in preparation for mips portRich Felker-1/+1
2012-05-04improve the build rules for installing /lib/ld-musl-$ARCH.soRich Felker-2/+4
these new rules should avoid spurious error messages when the directory (usually /lib) and the dynamic linker symlink already exist, and minimize the spam when they can't be created.
2012-05-03make all .o files depend on *_impl.h and libc.hRich Felker-2/+3
hopefully the annoyance of this will be minimal. these files all define internal interfaces which can change at any time; if different modules are using different versions of the interfaces, the library will badly break. ideally we would scan and add the dependency only for C files that actually reference the affected interfaces, but for now, err on the side of caution and force a rebuild of everything if any of them have changed. this commit is in preparation for the upcoming ssp overhaul commit, which will change internals of the pthread struct.
2012-05-02PIE support for i386Rich Felker-1/+1
2012-05-01reorganize Makefile to support "least surprise" config/make semanticsRich Felker-11/+23
the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
2012-05-01remove objcopy --weaken from the makefileRich Felker-2/+0
as far as I can tell, it's not useful and never way. I wrote it way back under the assumption that non-weak symbols in the POSIX or extension namespace could conflict with legitimate uses of the same symbol name in the main program or other libraries, but that does not seem to be the case.
2012-04-22new gcc wrapper, entirely specfile basedRich Felker-3/+7
the _concept_ of this wrapper has been tested extensively, but the integration with the build/install system, and using a persistent specfile rather than one generated at build-time, have not been heavily tested and may need minor tweaks. this approach should be a lot more robust (and easier to improve) than writing a shell script that's responsible for trying to mimic gcc's logic about whether it's compiling or linking, building shared libs or executable files, etc. it's also lighter weight and should result in mildly faster builds when using the wrapper.
2012-03-17don't fail on inability to install dynamic linker (e.g. if not root)Rich Felker-1/+1
2012-03-01search internal headers firstRich Felker-1/+1
this is necessitated by the ugly <syscall.h> just added
2012-02-17two fixes for "make install" handling of shared libsRich Felker-1/+2
1. don't try to install (and thus build) shared libs when they were disabled in config.mak 2. ensure that the path for the dynamic linker exists before attempting to install it.
2011-06-28fix a few bugs from last dynamic linking build system commitRich Felker-2/+2
some cruft was left and DESTDIR was not being used correctly.
2011-06-27cleanup shared library build system to be more $HOME-local-install friendlyRich Felker-13/+15
the path for the dynamic linker is now configurable, and failure to install the symlink for it will not stop the build.
2011-06-24use soname in ld-musl.so to prevent filename appearing in DT_NEEDEDsRich Felker-1/+1
2011-06-24use symlink rather than bogus linker script for libc.soRich Felker-2/+2
the linker script caused a bogus DT_NEEDED entry
2011-06-23adapt build/install/gcc-wrapper systems for dynamic linking supportRich Felker-5/+15
2011-02-24various changes in preparation for dynamic linking supportRich Felker-3/+3
prefer using visibility=hidden for __libc internal data, rather than an accessor function, if the compiler has visibility. optimize with -O3 for PIC targets (shared library). without heavy inlining, reloading the GOT register in small functions kills performance. 20-30% size increase for a single libc.so is not a big deal, compared to comparaible size increase in every static binaries. use -Bsymbolic-functions, not -Bsymbolic. global variables are subject to COPY relocations, and thus binding their addresses in the library at link time will cause library functions to read the wrong (original) copies instead of the copies made in the main program's bss section. add entry point, _start, for dynamic linker.
2011-02-17avoid deleting the lib/empty fileRich Felker-1/+1
2011-02-17new solution for empty lib dir (old one had some problems)Rich Felker-7/+5
2011-02-17improve Makefile handling of git checkouts with missing lib/ and config.makRich Felker-4/+8
2011-02-15finish unifying thread register handling in preparation for portingRich Felker-1/+1
2011-02-15preparing build system to handle ports - step 1Rich Felker-0/+6
2011-02-13ensure that musl is compiled as C99 code & XSI option is available in headersRich Felker-1/+1
2011-02-12initial check-in, version 0.5.0v0.5.0Rich Felker-0/+97