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Demos: Link our normal startfiles into the dynamic lib demo

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Now that gcc knows about crtbeginS and crtendS, and knows not to link
crt0.o into shared objects, we can get rid of the hacks required due to
--nostartfiles.
This commit is contained in:
Andrew Kaster 2020-01-01 14:21:28 -05:00 • committed by Andreas Kling
parent 2979491512
commit a755b80057
2 changed files with 3 additions and 10 deletions
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8
Demos/DynamicLink/LinkLib/DynamicLib.cpp
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@ -3,14 +3,10 @@
#include <assert.h>
#include <stdio.h>
// FIXME: See Makefile. We need -ffreestanding and -nostartfiles to
// Get GCC to stop linking crt0.o w/our .so.
// So, we need __dso_handle. ... Yikes
extern void* __dso_handle __attribute__((__section__(".sdata")));
extern void* __dso_handle __attribute__((__visibility__("hidden")));
void* __dso_handle = (void*)1234; // FIXME: Is the dynamic linker supposed to set this value?
// FIXME: Things defined in crt0 >:(
// We need to figure out a better way to get these symbols defined and available
// Even if we're linking a shared object.
__thread int errno;
char* __static_environ[] = { nullptr }; // We don't get the environment without some libc workarounds..
char** environ = __static_environ;

5
Demos/DynamicLink/LinkLib/Makefile
View file

@ -11,8 +11,5 @@ all: $(DYNLIBRARY)
DynamicLib.o: DynamicLib.cpp
$(CXX) -DDEBUG -fPIC -isystem../../../ -o $@ -c $<
# FIXME: Why do I need -nostartfiles and -nofreestanding?
# GCC isn't smart enough to not link crt0 against this dynamic lib
# which is clearly wrong. Isn't it? We don't want _start...
$(DYNLIBRARY): DynamicLib.o
$(CXX) -shared -nostartfiles -ffreestanding -o $(DYNLIBRARY) $<
$(CXX) -shared -o $(DYNLIBRARY) $<