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https://issues.apache.org/jira/browse/MATH-721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221696#comment-13221696
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Jörg Prante commented on MATH-721:
----------------------------------
Replacing constant 2.2250738585072014E-308 (MIN_NORMAL) with
java.lang.Double.longBitsToDouble(0x0010000000000000L)
is a workaround. Could be a Solaris SPARC compiler optimization issue when
parsing float constants.
> building common-math on Solaris SPARC gives "error: floating point number too
> small"
> ------------------------------------------------------------------------------------
>
> Key: MATH-721
> URL: https://issues.apache.org/jira/browse/MATH-721
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 2.2
> Environment: Build environment is:
> mvn --version
> Apache Maven 3.0.3 (rNON-CANONICAL_2011-10-13_22-23_builder; 2011-10-13
> 22:23:49+0200)
> Maven home: /usr/local/share/maven-3.0.3
> Java version: 1.7.0-internal, vendor: Oracle Corporation
> Java home: /usr/local/share/jdk1.7.0_1/jre
> Default locale: de_DE, platform encoding: UTF-8
> OS name: "sunos", version: "5.10", arch: "sparc", family: "unix"
> Reporter: Jörg Prante
>
> It seems the assumption in MathUtils.java
> /** Safe minimum, such that 1 / SAFE_MIN does not overflow.
> * <p>In IEEE 754 arithmetic, this is also the smallest normalized
> * number 2<sup>-1022</sup>.</p>
> */
> public static final double SAFE_MIN = 0x1.0p-1022;
> does not work on my openjdk 1.7.0_1 on Solaris SPARC, because I get the
> following build error:
> [INFO] Compiling 457 source files to
> /opt/builder/projects/commons-math-2.2-src/target/classes
> [INFO] -------------------------------------------------------------
> [ERROR] COMPILATION ERROR :
> [INFO] -------------------------------------------------------------
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/main/java/org/apache/commons/math/util/MathUtils.java:[42,42]
> error: floating point number too small
> [INFO] 1error
> [INFO] -------------------------------------------------------------
> [INFO]
> ------------------------------------------------------------------------
> [INFO] BUILD FAILURE
> and also in the tests I encounter the error when parsing floating point
> constants
> [ERROR] Failed to execute goal
> org.apache.maven.plugins:maven-compiler-plugin:2.1:testCompile
> (default-testCompile) on project commons-math: Compilation failure:
> Compilation failure:
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/test/java/org/apache/commons/math/util/FastMathTest.java:[1050,69]
> error: floating point number too small
> [ERROR]
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/test/java/org/apache/commons/math/util/FastMathTest.java:[1055,28]
> error: floating point number too small
> [ERROR]
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/test/java/org/apache/commons/math/util/FastMathTest.java:[1055,69]
> error: floating point number too small
> [ERROR]
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/test/java/org/apache/commons/math/util/FastMathTest.java:[1056,28]
> error: floating point number too small
> [ERROR]
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/test/java/org/apache/commons/math/util/FastMathTest.java:[1062,70]
> error: floating point number too small
> [ERROR]
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/test/java/org/apache/commons/math/util/FastMathTest.java:[1063,70]
> error: floating point number too small
> [ERROR]
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/test/java/org/apache/commons/math/util/FastMathTest.java:[1068,70]
> error: floating point number too small
> [ERROR]
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/test/java/org/apache/commons/math/util/FastMathTest.java:[1069,70]
> error: floating point number too small
> [ERROR]
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/test/java/org/apache/commons/math/optimization/general/LevenbergMarquardtOptimizerTest.java:[503,51]
> error: floating point number too small
> [ERROR]
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/test/java/org/apache/commons/math/optimization/general/LevenbergMarquardtOptimizerTest.java:[503,66]
> error: floating point number too small
> [ERROR]
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/test/java/org/apache/commons/math/estimation/LevenbergMarquardtEstimatorTest.java:[583,52]
> error: floating point number too small
> [ERROR]
> [ERROR]
> /opt/builder/projects/commons-math-2.2-src/src/test/java/org/apache/commons/math/estimation/LevenbergMarquardtEstimatorTest.java:[585,52]
> error: floating point number too small
> I suggest using java.lang.Double.MIN_NORMAL for a platform normalized minimal
> floating point value.
> A quick program for printing Double.MIN_NORMAL gives the following result.
> class test {
> public static void main(String[] args) {
> System.out.println("min float = " + Double.MIN_NORMAL );
> }
> }
> java test
> min float = 2.2250738585072014E-308
> Could it be an openjdk glitch? Thank you for any comments and help how this
> could be fixed.
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