Use response file when generating LLVM-C.dll

As discovered in D56774 the command line gets to long, so use a response file
to give the script the libs. This change has been tested and is confirmed
working for me.

Commited on behalf of Jakob Bornecrantz.
Differential Revision: https://reviews.llvm.org/D56781

llvm-svn: 356443

2 files changed, 36 insertions, 3 deletions

diff --git a/llvm/tools/llvm-shlib/CMakeLists.txt b/llvm/tools/llvm-shlib/CMakeLists.txt
index 187066e5ded..af44b8ae853 100644
--- a/llvm/tools/llvm-shlib/CMakeLists.txt
+++ b/llvm/tools/llvm-shlib/CMakeLists.txt
@@ -132,18 +132,40 @@ if(MSVC)
     set(GEN_UNDERSCORE "")
   endif()
 
+  # Set this name here, not used in multi conf loop,
+  # but add script will pick the right one.
+  set(LIBSFILE ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/libllvm-c.args)
+
   # Get the full name to the libs so the python script understands them.
   foreach(lib ${LIB_NAMES})
     list(APPEND FULL_LIB_NAMES ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib/${lib}.lib)
   endforeach()
 
+  # Need to seperate lib names with newlines.
+  string(REPLACE ";" "\n" FILE_CONTENT "${FULL_LIB_NAMES}")
+
+  if(NOT "${CMAKE_CFG_INTDIR}" STREQUAL ".")
+    foreach(BUILD_MODE ${CMAKE_CONFIGURATION_TYPES})
+      # Replace the special string with a per config directory.
+      string(REPLACE ${CMAKE_CFG_INTDIR} ${BUILD_MODE} PER_CONF_CONTENT "${FILE_CONTENT}")
+
+      # Write out the full lib names into file to be read by the python script.
+      # One libsfile per build, the add_custom_command should expand
+      # ${CMAKE_CFG_INTDIR} correctly and select the right one.
+      file(WRITE ${CMAKE_BINARY_DIR}/${BUILD_MODE}/libllvm-c.args "${PER_CONF_CONTENT}")
+    endforeach()
+  else()
+    # Write out the full lib names into file to be read by the python script.
+    file(WRITE ${LIBSFILE} "${FILE_CONTENT}")
+  endif()
+
   # Generate the exports file dynamically.
   set(GEN_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/gen-msvc-exports.py)
 
   set(LLVM_EXPORTED_SYMBOL_FILE ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/libllvm-c.exports)
 
   add_custom_command(OUTPUT ${LLVM_EXPORTED_SYMBOL_FILE}
-    COMMAND ${PYTHON_EXECUTABLE} ${GEN_SCRIPT} ${FULL_LIB_NAMES} ${GEN_UNDERSCORE} --nm ${LLVM_TOOLS_BINARY_DIR}/llvm-nm -o ${LLVM_EXPORTED_SYMBOL_FILE}
+    COMMAND ${PYTHON_EXECUTABLE} ${GEN_SCRIPT} --libsfile ${LIBSFILE} ${GEN_UNDERSCORE} --nm ${LLVM_TOOLS_BINARY_DIR}/llvm-nm -o ${LLVM_EXPORTED_SYMBOL_FILE}
     DEPENDS ${LIB_NAMES} llvm-nm
     COMMENT "Generating export list for LLVM-C"
     VERBATIM )
diff --git a/llvm/tools/llvm-shlib/gen-msvc-exports.py b/llvm/tools/llvm-shlib/gen-msvc-exports.py
index 2b7291de28b..671faf11528 100644
--- a/llvm/tools/llvm-shlib/gen-msvc-exports.py
+++ b/llvm/tools/llvm-shlib/gen-msvc-exports.py
@@ -83,6 +83,10 @@ def main():
     parser = argparse.ArgumentParser('gen-msvc-exports')
 
     parser.add_argument(
+        '-i', '--libsfile', help='file with list of libs, new line separated',
+        action='store', default=None
+    )
+    parser.add_argument(
         '-o', '--output', help='output filename', default='LLVM-C.exports'
     )
     parser.add_argument('-u', '--underscore',
@@ -93,12 +97,19 @@ def main():
         '--nm', help='path to the llvm-nm executable', default='llvm-nm'
     )
     parser.add_argument(
-        'libs', metavar='LIBS', nargs='+', help='list of libraries to generate export from'
+        'libs', metavar='LIBS', nargs='*', help='list of libraries to generate export from'
     )
 
     ns = parser.parse_args()
 
-    gen_llvm_c_export(ns.output, ns.underscore, ns.libs, ns.nm)
+    libs = ns.libs
+
+    # Add if we where given a libsfile add it to the libs.
+    if ns.libsfile:
+        with open(ns.libsfile) as f:
+            libs.extend(f.read().splitlines())
+
+    gen_llvm_c_export(ns.output, ns.underscore, libs, ns.nm)
 
 
 if __name__ == '__main__':