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UnitTestFrameworkPkg: Fix Google Test components with multiple files 

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4610

Google Test hides test registration in global constructors on global
objects. Global constructors are traditionally implemented by placing
references to the global constructor's symbol in special sections
(traditionally named .ctors or .init_array). These sections are not
explicitly referenced by the linker, and libc only looks at special
start and end symbols (and calls them).

This works fine if you're linking a program manually using

    gcc a.o b.o c.o -o test_suite

but fails miserably when using static libraries (such as what EDK2
does), because traditional static archive symbol resolution rules don't
allow for object files to be pulled in to the link if there isn't an
undefined symbol reference to that .o elsewhere.

Fix it by passing --whole-archive (GCC) and /WHOLEARCHIVE (MSVC). These
options force the linker to pull in the entire static library, thus
including previously-unreferenced constructors and making sure
multi-file gtest EDK2 components work.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Michael Kubacki <mikuback@linux.microsoft.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Signed-off-by: Pedro Falcato <pedro.falcato@gmail.com>
Reviewed-by: Cc: Michael D Kinney <michael.d.kinney@intel.com>
This commit is contained in:
Pedro Falcato 2023-11-30 14:42:13 -08:00 committed by mergify[bot]
parent 70b174e24d
commit c3769e392b
1 changed files with 7 additions and 2 deletions
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9
UnitTestFrameworkPkg/UnitTestFrameworkPkgHost.dsc.inc
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@ -37,7 +37,7 @@
# MSFT # MSFT
# #
MSFT:*_*_*_CC_FLAGS = /EHsc MSFT:*_*_*_CC_FLAGS = /EHsc
MSFT:*_*_*_DLINK_FLAGS == /out:"$(BIN_DIR)\$(MODULE_NAME_GUID).exe" /pdb:"$(BIN_DIR)\$(MODULE_NAME_GUID).pdb" /IGNORE:4001 /NOLOGO /SUBSYSTEM:CONSOLE /DEBUG /STACK:0x40000,0x40000 /NODEFAULTLIB:libcmt.lib libcmtd.lib MSFT:*_*_*_DLINK_FLAGS == /out:"$(BIN_DIR)\$(MODULE_NAME_GUID).exe" /pdb:"$(BIN_DIR)\$(MODULE_NAME_GUID).pdb" /IGNORE:4001 /NOLOGO /SUBSYSTEM:CONSOLE /DEBUG /STACK:0x40000,0x40000 /WHOLEARCHIVE
MSFT:*_*_IA32_DLINK_FLAGS = /MACHINE:I386 MSFT:*_*_IA32_DLINK_FLAGS = /MACHINE:I386
MSFT:*_*_X64_DLINK_FLAGS = /MACHINE:AMD64 MSFT:*_*_X64_DLINK_FLAGS = /MACHINE:AMD64
@ -56,7 +56,12 @@
# #
GCC:*_*_IA32_DLINK_FLAGS == -o $(BIN_DIR)/$(MODULE_NAME_GUID) -m32 -no-pie GCC:*_*_IA32_DLINK_FLAGS == -o $(BIN_DIR)/$(MODULE_NAME_GUID) -m32 -no-pie
GCC:*_*_X64_DLINK_FLAGS == -o $(BIN_DIR)/$(MODULE_NAME_GUID) -m64 -no-pie GCC:*_*_X64_DLINK_FLAGS == -o $(BIN_DIR)/$(MODULE_NAME_GUID) -m64 -no-pie
GCC:*_*_*_DLINK2_FLAGS == -lgcov -lpthread -lstdc++ -lm #
# Surround our static libraries with whole-archive, so constructor-based test registration works properly.
# Note that we need to --no-whole-archive before linking system libraries.
#
GCC:*_*_*_DLINK_FLAGS = -Wl,--whole-archive
GCC:*_*_*_DLINK2_FLAGS == -Wl,--no-whole-archive -lgcov -lpthread -lstdc++ -lm
# #
# Need to do this link via gcc and not ld as the pathing to libraries changes from OS version to OS version # Need to do this link via gcc and not ld as the pathing to libraries changes from OS version to OS version