firefox: overhaul LTO

Enable LTO support on Linux by default again. Add patch to fix dependentlibs.list generation under LTO. This is necessary for fixing firefox-wayland crashing when built with LTO. Add makeFlags which set ar, ranlib, and nm to be llvm-ar, llvm-ranlib and llvm-nm when building with llvm-based LTO. (bmo#1480005)
2021-01-13 08:06:48 -05:00
parent 40b4eb1c52
commit 7415d0589d
2 changed files with 69 additions and 8 deletions
@@ -0,0 +1,45 @@
+--- a/toolkit/library/build/dependentlibs.py
+++ b/toolkit/library/build/dependentlibs.py
+@@ -36,26 +36,17 @@ def dependentlibs_win32_objdump(lib):
+     proc.wait()
+     return deps
+ 
+-def dependentlibs_readelf(lib):
+def dependentlibs_elf_objdump(lib):
+     '''Returns the list of dependencies declared in the given ELF .so'''
+-    proc = subprocess.Popen([substs.get('TOOLCHAIN_PREFIX', '') + 'readelf', '-d', lib], stdout = subprocess.PIPE,
+    proc = subprocess.Popen([substs['LLVM_OBJDUMP'], '--private-headers', lib], stdout = subprocess.PIPE,
+                             universal_newlines=True)
+     deps = []
+     for line in proc.stdout:
+-        # Each line has the following format:
+-        #  tag (TYPE)          value
+-        # or with BSD readelf:
+-        #  tag TYPE            value
+-        # Looking for NEEDED type entries
+-        tmp = line.split(' ', 3)
+-        if len(tmp) > 3 and 'NEEDED' in tmp[2]:
+-            # NEEDED lines look like:
+-            # 0x00000001 (NEEDED)             Shared library: [libname]
+-            # or with BSD readelf:
+-            # 0x00000001 NEEDED               Shared library: [libname]
+-            match = re.search('\[(.*)\]', tmp[3])
+-            if match:
+-                deps.append(match.group(1))
+        # We are looking for lines with the format:
+        #   NEEDED             libname
+        tmp = line.split()
+        if len(tmp) == 2 and tmp[0] == 'NEEDED':
+            deps.append(tmp[1])
+     proc.wait()
+     return deps
+ 
+@@ -110,7 +101,7 @@ def gen_list(output, lib):
+     libpaths = [os.path.join(substs['DIST'], 'bin')]
+     binary_type = get_type(lib)
+     if binary_type == ELF:
+-        func = dependentlibs_readelf
+        func = dependentlibs_elf_objdump
+     elif binary_type == MACHO:
+         func = dependentlibs_mac_objdump
+     else: